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静摩擦力

> 如图，物体在水平力F作用下静止在斜面上。若稍许增大F，仍使物体静止在斜面上，则斜面对物体的静摩擦力F f、支持力F N以及F f和F N的合力F′变化情况是（） A．Ff不一定增大，FN一定增大，F′一定增大 B．Ff一定增大，FN一定增大，F′不变 C．Ff、FN、F′均增大 D．Ff、FN不一定增大，F′一定增大

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发布时间：2024-09-12

如图，物体在水平力F作用下静止在斜面上。若稍许增大F，仍使物体静止在斜面上，则斜面对物体的静摩擦力F _f、支持力F _N以及F _f和F _N的合力F′变化情况是（）

A．F_f不一定增大，F_N一定增大，F′一定增大 B．F_f一定增大，F_N一定增大，F′不变

C．F_f、F_N、F′均增大 D．F_f、F_N不一定增大，F′一定增大

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